Hi,
Have tried to search but can't find an answer. I have a MY2014 limited with 20's and want to get people's opinions on how they go in sand. Not looking at anything too hardcore, just some tracks and beaches. With the lower profile than the 18's what pressure would you run? Have heard between 15 and 20 psi.

This is a depends sort of question, I run 18psi on the sand with my 17" Mickey Thomson ATZ on the cruiser, but there is sand and there is sand. Once you are on the firm stuff it is like a road, you don't need low pressure and you don't want to be running very low pressure doing 80kph either. It is the soft sand that you need the lower pressure for, mainly around the cuttings on and off the beach.

The other issue is the strength of the tyre wall, some tyres can go to lower pressure without damaging the wall, others will damage easily.

If it were me with stock tyres, I'd go down to 20 or 22 and see how it goes, if I get stuck I'd let a bit more out.

I recently ran the 20" wheels with stock Kumho's on Fraser Is. Whilst the hard sand on the beach was no issue, some of the inland tracks proved more challenging than expected. I initially ran 20 psi to which I ended up bogged 3 times in 2 days. After that I took it down to 18 psi which I think was a little better (I didn't get bogged again) but then I hit a tree root and damaged the tyre sidewall. Tyre trashed.
So the 20's are ok if you take care but I've swapped mine for some OE 18's with AT's to have a "buffer" next time. :-)

I have had my GC with 20inch rims on Fraser Island twice, Moreton Island twice, and probably 4 or 5 trips to double Island Point, all for duration at least 4 or 5 days each in time in the last 18 months.

I initially was concerned about the 20inch rims (this is my first 4x4 with 20inch), but in my experience I can say that I am not concerned any more. I always run 20psi (I let them down hot, so that probably equates to around 18psi cold).

So far I have never been bogged (apart from a little incident with the infamous "serv 4wd" issue) and have encountered some really bad conditions. I'm very impressed with the capability of the Jeep. I really do think the 20inch rims will get you almost anywhere on the sand that the 18inches will. I think that experience driving on sand (the soft stuff) will be the biggest determinant of whether you get stuck or not.

My main concern is driving over rocks, etc, as the low side wall means more likely to damage the rims. Likewise with debris in the deep sand.

I have the stock 20" rims and have just had my first day out driving across the Qatar desert to the Inland Sea (30-40km each way), which involves driving over some very large (100') sand dunes and some very deep soft sand. I had 20psi set and was expecting problems but none came. Bogged in a couple of times on steep climbs but just backed out and tried again with a little more momentum and got through every time. At the very end of the day the traction control warning light came on but after 2-3 minutes on the tarmac road it cleared.

On the steepest and deepest parts I selected low range to guarantee 4WD but no errors displayed.

Very happy as was expecting to have to fork out for 18" rims and tyres.

Good news skycop. Check out dunecrawler's posts about 20in rims in dunes. My traction control warning light comes on a bit, often in soft sand, but will go off after driving in harder sand for a while or driving through a wash out. My feeling is sand gets into the wheel speed sensors meaning they can't operate properly. Not sure though...